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A S P M E T E R S P L I T C O R E
—
ASPMETER split core
Wiring
Power must be disconnected and locked out before
making any wiring connections.
Connect 2-wire or 4-wire Modbus RS-485 daisy chain network
(Figures 1 and 2).
Figure 1.
2-wire
2-wire
Master or Slave
Master or Slave
Figure 2.
2-wire
Master or Slave
SHIELD
SHIELD
SHIELD
4-wire
4-wire
Master
Master
4-wire
Master
SHIELD
SHIELD
SHIELD
SHIELD
SHIELD
RX- TX-
RX- TX-
RX+ TX+
RX+ TX+
SHIELD
TX-
TX-
RX- TX-
TX+
TX+
RX+ TX+
TX-
TX+
SHIELD
SHIELD
SHIELD
Slave
Slave
Slave
SHIELD
SHIELD
SHIELD
1. Mechanically secure the RS-485 cable where it enters
the electrical panel.
2. Connect all RS-485 devices in a daisy-chain fashion,
and properly terminate the chain (Figure 3).
Figure 3.
2-wire example
2-wire example
Belden 1120A or
Belden 1120A or
equivalent
equivalent
2-wire example
Belden 1120A or
equivalent
–
–
+
+
Not Used
Not Used
–
+
3. Shield the RS-485 cable using twisted-pair wire, such as
Not Used
Belden 1120A. The cable must be voltage-rated for the
installation.
4. When tightening terminals, ensure that the correct torque
is applied: 0.5 to 0.6 N·m (0.37 to 0.44 ft·lb) for connectors
on main board, 0.22 to 0.26 N·m (0.16 to 0.19 ft·lb) for
connectors on adapter boards (Figure 4).
Figure 4.
WARNING: After wiring the RS-485 cable, remove all
scraps of wire or foil shield from the electrical panel.
Wire scraps coming into contact with high voltage
conductors could be DANGEROUS!
19
120 Ω terminator
120 Ω terminator
on last device of
on last device of
daisy chain
daisy chain
120 Ω terminator
on last device of
daisy chain
–
–
+
+
–
+
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